The final one is Soloman's Seal. I know the first plant as Lambs Ears not sure what it's proper name is.
That looks like bindweed to me
Move them when the roots are visible coming out from the bottom of the tray/pot. When planting in the garden I would also scatter slug pellets to protect them as they are caviar for slugs and snails
It could be Bay sucker, the damaged areas dry up and turn brown. Leaves may also curl up. You may find small nymphs on the underside of the leaves. There is no cure, just remove the affected leaves.
I think it's a Kerria Japonica
It could be a Campanula, bellflower.
I had 14 frogs in my pond earlier today and first spawn recorded. I'm in northHampshire
The grass one looks more like a reed than grass.
If they have been stored somewhere dry they should be OK. If they have spent the winter wet it's possible that any nutrients in them will have washed out so not much good for growing plants on but great as a mulch for the garden
Cornus and Salix would give add winter colour and both will tolerate clay and shade